Created attachment 31207[details]
the diff for this patch
Currently, a style is only applied to a cell if the cell style attribute ("s") is present. Following XSSFCell.getCellStyle(), if the attribute is not present, and there are are more than 0 styles in the styles table, we should use the default (0) style.
This patch may also be the resolution for https://issues.apache.org/bugzilla/show_bug.cgi?id=55648.

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